Category
Cosmology
Explore the 2 entries currently assigned to this category. These counts describe this curated catalogue, not the size or rate of change of the field itself.
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Not a fact anymore
Galaxies are scattered through the universe more or less randomly.
What we know now
Galaxies form a cosmic web of clusters, filaments, sheets, and vast voids shaped by gravity acting on early density variations.
- Status
- Overturned
- Category
- Cosmology
- Accepted for
- ≈70 years
- Changed approximately
- 1970s–1990s
Not a fact anymore
The gravitating mass of galaxies and galaxy clusters can be accounted for almost entirely by the stars and gas that astronomers can observe directly.
What we know now
The stars, glowing gas, planets, and other ordinary matter we can observe directly make up only a small part of the modern cosmic inventory. Gravity requires much more dark matter around galaxies and clusters, while cosmological measurements indicate that dark energy contributes an even larger share of the universe's total energy density.
- Status
- Superseded
- Category
- Cosmology
- Accepted for
- ≈55 years
- Changed approximately
- 1930s–1970s, consolidated later
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